⛽ Fuel Cost Calculator
Road-trip budgeting is one division and one multiplication: distance divided by efficiency gives fuel used, times the price per unit gives the cost. This calculator handles both mpg and L/100km, plus miles or kilometers.
The per-mile (or per-km) figure is handy for comparing cars: a small efficiency gap compounds fast over a long trip.
How to use this calculator
Enter the trip distance, your vehicle's fuel efficiency, and the fuel price, and the calculator returns the total trip cost plus fuel needed.
- Enter the Trip distance and pick Miles or Kilometers.
- Enter the Fuel efficiency and pick Miles per gallon or Liters per 100 km.
- Enter the Fuel price and pick Gallon or Liter as the price unit.
- Read the trip cost, the fuel needed, and the cost per mile or kilometer.
Frequently asked questions
What formula does the Fuel Cost Calculator use?
Fuel used equals distance divided by efficiency, and trip cost equals fuel used times the price per unit. Metric and imperial inputs are converted internally so any combination works.
Can you give a worked example?
A 300 mile trip at 30 mpg uses 10 gallons, which at $3.50 per gallon costs $35.00, or about $0.117 per mile.
Can I use metric units?
Yes. Enter kilometers with liters per 100 km and a per-liter price: 500 km at 8 L/100km uses 40 liters, costing $60.00 at $1.50 per liter.
Does it account for traffic or driving style?
No. It assumes the efficiency figure you enter, so use your real-world average rather than the brochure number for the most honest estimate.